18156484513 has 2 divisors, whose sum is σ = 18156484514. Its totient is φ = 18156484512.

The previous prime is 18156484481. The next prime is 18156484529. The reversal of 18156484513 is 31548465181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17983614609 + 172869904 = 134103^2 + 13148^2 .

It is an emirp because it is prime and its reverse (31548465181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18156484513 - 2⁵ = 18156484481 is a prime.

It is not a weakly prime, because it can be changed into another prime (18156484543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9078242256 + 9078242257.

It is an arithmetic number, because the mean of its divisors is an integer number (9078242257).

Almost surely, 2^18156484513 is an apocalyptic number.

It is an amenable number.

18156484513 is a deficient number, since it is larger than the sum of its proper divisors (1).

18156484513 is an equidigital number, since it uses as much as digits as its factorization.

18156484513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 460800, while the sum is 46.

The spelling of 18156484513 in words is "eighteen billion, one hundred fifty-six million, four hundred eighty-four thousand, five hundred thirteen".